88 HYDROZOA. 



which allusion has already been made. Lastly, 

 in Lav, each polypite supports but two tentacles, 

 above which the mouth is furnished with a pair of 

 wide projecting lobes, capable of being approxi- 

 mated closely to each other, and serving, doubt- 

 less, as efficient organs of prehension. 



The gonophores of the Corynidce vary not a 

 little both in structure and mode of attachment. 

 In Cordylophora, Perigonimus, Garveia, Bimeria, 

 and some forms of Eudendrium and Atracfylis, 

 they spring directly from the stem or branches of 

 the coenosarc. In other species of the two last- 

 mentioned genera they are seated either beneath 

 the tentacles of the polypites, or on the summits 

 of special branches, arising from the proximal 

 region of the hydrosoma (fig. i6, b). In Myrio- 

 thela, Acaulis, and Clavatella, the gonophores 

 have their origin on the polypite, not far from its 

 attached extremity: in Coryne and Stauridia, they 

 are produced between the tentacles {fig. 1 7, d). 

 In Co'iymorpha and some species of Tuhularia, 

 they are supported on long branching gonoblas- 

 tidia, inserted immediately within the basal circlet 

 of tentacula {fig. 9, h) : in other Tuhidarice, T. 

 calaiiiaris and T. Dumortierii, as also in the genus 

 Fennaria, these long stalks appear to be absent. 

 The arrangement of the reproductive bodies in 

 Clava and Hydractinia has already been pointed 

 out. In the closely allied genera, Dicoryne and 

 Fodocoryne, they originate, in a somewhat simi- 

 lar manner, on proper gonoblastidia, never on the 

 ordinary polypites. But the proliferous stalks of 

 Fodocoryne are furnished, each, with a mouth, 

 and differ little from true polypites save in their 

 smaller size and the possession of fewer tentacula. 



